Carbureter.



J. W. STEVENS.

CARBURETER.

APPLICATION FILED DEC-15,1913.

' Patented May 30,1916.

WITNESSES 4; FAN FlWlEt CARBUBE'IER.

Specification of Letters Patent.

Patented May 8(1 1918.

Application filed December 15, 1918. Serial No. 806,696.

To all whom it may concern Be it known that 1, JOHN W. STEVENS, a citizen of the United States, resident of St. Paul, county of Ramsey, State of Minnesota, have invented certain new and useful Improvements in Carburetors, of which the following is a specification.

The object of my invention is to provide a carbureter having an air control which can be regulated from the drivers seat, and dispensing with fluttering or vibrating parts and the separate throttle valve usually provided in a carburetor of the ordlnary type.

A further object is to provide a carbureter which will admit a specific and predetermined volume of air and having means within the control of the driver for increasing the volume of air admitted, according to atmospheric conditions and the speed required.

Other objects of the invention will appear from the following detailed description.

The invention consists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims.

In the accompanying drawings forming part of this specification, Figure 1 is a vertical sectional view through a carburetor embodying my invention, Fig. 2 is a similar view on a section line at right angles sub.- stantially to the section line of Fig. 1. Fig. 3 is a side view of that portion of the carbureter which controls the admission of air to the mixing chamber, Fig. 4 is a sectional view on the line ccm of Fig. 3, Fig. 5 is a detail sectional view illustrating a modified construction.

In the drawing, 2 represents a casing having a fuel chamber or reservoir 3 communicating through a passage 4 and a valve 5 with a source of fuel supply (not shown).

' The movement of the valve is controlled by the usual float 6, which encircles an inner casing or shell 7 between which and the walls of the casing 2 the reservoir 3 is formed. The casing 2 has a removable top 8 allowing access to a chamber 9 within the casing 7 through the open top 10 of said chamber. From. this chamber a passage 11 leads to the engine cylinders (not shown).

In the base of the casing 7 is a fuel passage 12 communicating with the chamber 3 and with a nozzle 18 which projects up into the chamber 9 and is provided with a needle valve 141 by means of which the flow of fuel through the nozzle is controlled in the usual way. Within the casing 7 I provide a cylindrical member 15 having an annular flange 16 that is seated in the wall of the casing 7 near the middle portion thereof and separates the lower portion of this chamber from the upper portion thereof. This cylinder is provided below said flange with ports 17, shown extending vertically in the wall of the cylinder at intervals in the surface thereof and spaced apart and communicating with the lower portion of the chamber 9 and with the open air through the passage 7. Above the flange 16 ports 18 are provided. Fitting within the cylinder 15 is a hollow member 19 preferably in the form of a truncated cone, having a flange 20 which is seated against the lower end of the cylinder 15, the nozzle 13 projecting upwardly into said member and terminating beneath and near ports 21 provided in the upper portion of said member. The cylinder 15 and the member 19 are normally stationary, and the ports 21 in the member 19 are' fixed in size and admit the mixture of air and fuel into the space inclosed by the cylinder 15.

Within the stationary cylinder 15 is a movable valve cylinder 22 shown as supported by the flange 20 and having ports 23 above the flange 16 and ports 24 below the flange 16 adapted to register respectively with the ports in the cylinder 15. The cylinder 22 has a stem 25 thereon provided with a lever 26 that is actuated by an arm 27 on a rock shaft 28 that is operated through a suitable mechanism extending to the drivers seat. This inner cylinder constitutes in effect the throttle of the engine, for by rotating it the driver can increase or decrease the area of the air ports in the cylinder 15 according to atmospheric conditions or the load on the engine. A stop pin 29 may be provided in the rotating inner cylinder for limiting its movement in both directions. The ports 18 are approximately equal in area to the combined area of the ports 17 and 21 and are so arranged that the ports 18 may, when partially opened, be equal substantially in area to the ports 21. When this relation exists between the ports 18 and 21, the ports 17 below the flange 16 will be entirely closed and the air currents then flow up through the ports 21 and out through the passages in the ports 18 on the openings of the ports 18 being substantially equal to the ports 21, the flow of air through them will not be retarded. V

In case it isdesired to increase the supply of air, .the valve cylinder is rotated in the opposite direction, increasing the openingsithroughthe ports 18 and exposing ad- I i 1 ditional' openings through the port 17 suifi- V V l r Volume. Asthe ports 17 are opened, a corcient te admit-the desired increase air I .respQ nl-d l gl gleater-area of the ports 18 'Will b,e*e p,osed-,. so that as the air intake openings are increased in area to] admit a greatervolume of air-to, the chamber within the cylinders, correspondingly larger area of the ports 18 will be exposed to accommodate this, increased volume of air, and

a perfect ratio, will :be maintained atfall' times in the operationofthe carbureter. In this: way a Supply oflfuel and air through the-Icarbnreter can be regulated by the j driver, according to the speed of the eni gd d th 'atm spheric conditions.

' the flange 16 will have the function of the That. portion of the'cylinder valve below auxiliary air intake of an ordinary carbureter, which usually becomes'operative under increased suction and higher speed of the engine. V 1

7 In F ig1-5 I have shown a modified: constructi'on in which an outer cylinder 3.0 is provided, having a supporting flange corresponding to the one "heretofore described and, telescoping-with a cylinder 31 that is a rrs a ed hrough he ite at o of a link 7 2 from a s i ab e m n These cy nde s inde ember a1.v

operation of this form :01? ,carbureter is the are1prhvided with upper and lower groups 'ofports 33,,34E, 35 and 3 6, the ports the member 30 being opened or closed a 'e r with the movement f'the reciprocating cy1 n, eth r spe t he same as described. above, the Stationary or we: wa r 'h 't e i w rd y pro-- ecting, preferably eons-shaped, 'niember f' 'sa nvention-1 hamber a d pr v ded w th p s therein c rre ponding o those; described w th eferen to Figsvarieus ways the "details ofconstruo t on hereln shown and described may be mpdiliedand b Withinthe scopeof my TI claim as my invention f ing'achainberformed therein provided with alr inletfand outlet openings and. a fuel 8 I nozzle projecting into said chamber,

concentric cylinders mounted within said relatlvely movableand hiLV",

tion of said cylinders,

l-QQ'A earbureter comprisinga casing having a wall separating said inlet opening from said outlet opening, one of said cylinders having a cone shaped member provided with a series of air inlet ports communicating With said air intake opening and into which member said fuel supply nozzle projects, said cylinder also having a series of ports communicating with said outlet opening, the other cylinder having ports adapted to register with the ports leading to said outlet opening and provided with means for partially closing said ports, the openings through said partially closed ports corresponding in area to the inlet ports in said member, and means for operating the movable cylinder. V

2. A carbureter comprising a casing having a chamber formed therein and inlet and outlet openings therefor, a stationary cylinder mounted within said chamber and having a wall dividing said chamber into independent compartments communicating respectively with said inlet and outlet openings, said cylinder having a cone shaped member formed therein provided with a series of air ports, a fuel supply nozzle projecting into said cone shaped member adjacent to. said ports, said cylinder also having a group of air ports above and below said wall, a movable cylinder concentric with said stationary cylinder and also having ports therein communicating respectively with said upper and lower groups of ports and arranged to partially close said upper group of ports and entirely close said lower group of ports, the area of the upper grQl p ofports in said stationary cylinder being equal substantially to the combined area of the ports in said member and said lower group of ports, in said stationary cylinder, and means for operating said movable cylinder. r

3. A carbureter comprising a casing hav-' ing a chamber formed therein provided with air inlet andoutlet openings and a fuel supply nozzle projecting into said chamber between said inlet and outlet openings, cylinders concentrically mounted within said chamber and relatively movable, a, wall separating the space in said chamber around the lower portion of said cylinders from the space in. said chamber around the upper porone of said cylinders having a central opening into which said nozzle projects and a truncated cone having a closed top encircling said opening within said cylinder, the upper portion of the walls of said cone being provided with a series of ports therein, the ports inthe upper portion of said cylinders communicating with the upper part of said chamber and the ports in the lower walls of said cylinders communicating with the lower part of said chamber, means for rotating one of said cylinders and the area of the upper group 1,184,888 till;

of ports in the stationary cylinder being equal substantially to the combined area of the ports in said cone and the lower group of ports in said cylinder.

4. A carbureter comprising a casing having a chamber formed therein provided with an air inlet opening in the bottom thereof and an outlet opening in the top thereof, a fuel supply nozzle projecting into said chamber through said inlet opening, cylinders concentrically mounted in said chamber and having groups of ports in their upper and lower walls, the ports of one cylinder registering respectively with the corresponding ports of the other cylinder, said cylinders being mounted for relative rotation to open or close said ports, said chamber being divided into upper and lower compartments, the lower compartment communicating with said inlet opening and with the lower groups of ports, the upper compartment communicating with the upper groups of ports and one of said cylinders having a member projecting therein and encircling said fuel supply nozzle and having a group of ports above said nozzle and between the groups of ports of said cylinders, substantially as described.

5. A carbureter comprising a casing having inlet and outlet openings and a fuel supply nozzle, concentric relatively movable members mounted within said casing and having groups of ports opened and closed by such relative movement, one of said members having a wall to encircle said nozzle, and provided with a port, the relative movement of said concentric members increasing or decreasing the area of the upper and lower groups of ports, substantially as described.

In witness whereof, I have hereunto set my hand this 10th day of December 1913.

JOHN W. STEVENS.

Witnesses:

EDWARD A. PAUL, GENEVIEVE E. SoRENsEN.

topics of this patent may be obtained for five cents each, by addressing the "Goseioner of Intent Washington, D. 0. 

